/Engine/Source/Developer/ShaderFormatOpenGL/Public/ShaderFormatOpenGL.h
Set up compilation information like defines and HlslCompileTarget
virtual void SetupPerVersionCompilationEnvironment ( [GLSLVersion](API\Developer\ShaderFormatOpenGL\GLSLVersion) Version, class [FShaderCompilerDefinitions](API\Runtime\RenderCore\FShaderCompilerDefinitions) & AdditionalDefines, EHlslCompileTarget & HlslCompilerTarget )